Add README file for the spec.

Author: bluegate010

specifications/device-identity-provisioning/README.md

@@ -0,0 +1,20 @@
+## Specification Website
+
+A version of the specification tracking the latest content in the `master` branch can be found at https://opencomputeproject.github.io/Security/device-identity-provisioning/HEAD/.
+
+## Specification source
+
+The specification source is available in [spec.ocp](./spec.ocp).
+
+## Building the specification
+
+To view a rendered version of the specification, clone the [ocp-spec-tools](https://github.com/opencomputeproject/ocp-spec-tools) repository, and then run:
+
+```sh
+$ path/to/ocp-spec-tools/docker-pull.sh
+$ path/to/ocp-spec-tools/docker-run.sh --html spec.html spec.ocp
+```
+
+## Maintaining the specification
+
+See [here](https://github.com/opencomputeproject/ocp-spec-tools/blob/main/README.md#tips-and-tricks) for guidance on maintaining the specification.